Deduplicate Invite3pid (#2074)

* Deduplicate Invite3pid

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

data/api/client-server/third_party_membership.yaml

@@ -76,37 +76,7 @@ paths:
         content:
           application/json:
             schema:
-              type: object
-              example: {
-                "id_server": "matrix.org",
-                "id_access_token": "abc123_OpaqueString",
-                "medium": "email",
-                "address": "cheeky@monkey.com"
-              }
-              properties:
-                id_server:
-                  type: string
-                  description: The hostname+port of the identity server which should be used for
-                    third-party identifier lookups.
-                id_access_token:
-                  type: string
-                  description: |-
-                    An access token previously registered with the identity server. Servers
-                    can treat this as optional to distinguish between r0.5-compatible clients
-                    and this specification version.
-                medium:
-                  type: string
-                  description: |-
-                    The kind of address being passed in the address field, for example
-                    `email` (see [the list of recognised values](/appendices/#3pid-types)).
-                address:
-                  type: string
-                  description: The invitee's third-party identifier.
-              required:
-                - id_server
-                - id_access_token
-                - medium
-                - address
+              $ref: definitions/invite_3pid.yaml
         required: true
       responses:
         "200":